NTT DoCoMo has recently introduced 19 new phones for the Japanese market. One of them is particularly interesting. The F-04B (part of the carrier's PRIME series) comes with a 12.1Mpix camera and a secondary VGA cam, and it supports microSD cards up to 16GB. But that's not what makes it unique. The F-04B is the world's first handset with a separable, two-module body. The screen portion can be separated from the keyboard, and still be operated via Bluetooth.
It will be available in march or April of 2010.